Produced by. Design Patterns. MSc in Computer Science. Eamonn de Leastar
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1 Design Patterns MSc in Computer Science Produced by Eamonn de Leastar Department of Computing, Maths & Physics Waterford Institute of Technology
2 POSA Patterns
3 Other sources - POSA - 5 Volumes!
4 Volume 4 Collates a terse description of large collection of patterns associated with Distributed Systems Repeats patterns from earlier volumes in series + patterns from GoF and PoEAA Extensive discussion on how multiple patterns participate in solving a given problem
5 Catalog (Extract) Sophisticated and Specialised
6 From Mud To Structure: DOMAIN MODEL (182), LAYERS (185), MODEL-VIEW-CONTROLLER (188), PRESENTATION-ABSTRACTION-CONTROL (191), MICROKERNEL (194), REFLECTION (197), PIPES AND FILTERS (200), SHARED REPOSITORY (202), BLACKBOARD (205), and DOMAIN OBJECT (208). attern Language Distribution Infrastructure: MESSAGING (221), MESSAGE CHANNEL (224), MESSAGE ENDPOINT (227), MESSAGE TRANSLATOR (229), MESSAGE ROUTER (231), BROKER (237), CLIENT PROXY (240), REQUESTOR (242), INVOKER (244), CLIENT REQUEST HANDLER (246), SERVER REQUEST HANDLER (249), and PUBLISHER-SUBSCRIBER (234). Event Demultiplexing and Dispatching: REACTOR (259), PROACTOR (262), ACCEPTOR-CONNECTOR (265), and ASYNCHRONOUS COMPLETION TOKEN (268). Interface Partitioning: EXPLICIT INTERFACE (281), EXTENSION INTERFACE (284), INTROSPECTIVE INTERFACE (286), DYNAMIC INVOCATION INTERFACE (288), PROXY (290), BUSINESS DELEGATE (292), FACADE (294), COMBINED METHOD (296), ITERATOR (298), ENUMERATION METHOD (300), and BATCH METHOD (302). Component Partitioning: ENCAPSULATED IMPLEMENTATION (313), WHOLE-PART (317), COMPOSITE (319), MASTER-SLAVE (321), HALF-OBJECT PLUS PROTOCOL (324), and REPLICATED COMPONENT GROUP (326). Application Control: PAGE CONTROLLER (337), FRONT CONTROLLER (339), APPLICATION CONTROLLER (341), COMMAND PROCESSOR (343), TEMPLATE VIEW (345), TRANSFORM VIEW (347), FIREWALL PROXY (349), and AUTHORIZATION (351). Concurrency: HALF-SYNC/HALF-ASYNC (359), LEADER/FOLLOWERS (362), ACTIVE OBJECT (365), MONITOR OBJECT (368). Synchronization: GUARDED SUSPENSION (380), FUTURE (382), THREAD-SAFE INTERFACE (384), DOUBLE- CHECKED LOCKING (386), STRATEGIZED LOCKING (388), SCOPED LOCKING (390), THREAD-SPECIFIC STORAGE (392), COPIED VALUE (394), and IMMUTABLE VALUE (396). Object Interaction: OBSERVER (405), DOUBLE DISPATCH (408), MEDIATOR (410), MEMENTO (414), CONTEXT OBJECT (416), DATA TRANSFER OBJECT (418), COMMAND (412), and MESSAGE (420). Adaptation and Extension: BRIDGE (436), OBJECT ADAPTER (438), INTERCEPTOR (444), CHAIN OF RESPONSIBILITY (440), INTERPRETER (442), VISITOR (447), DECORATOR (449), TEMPLATE METHOD (453), STRATEGY (455), NULL OBJECT (457), WRAPPER FACADE (459), EXECUTE-AROUND OBJECT (451), and DECLARATIVE COMPONENT CONFIGURATION (461). Object Behavior: OBJECTS FOR STATES (467), METHODS FOR STATES (469), and COLLECTIONS FOR STATES (471). Resource Management: OBJECT MANAGER (492), CONTAINER (488), COMPONENT CONFIGURATOR (490), LOOKUP (495), VIRTUAL PROXY (497), LIFECYCLE CALLBACK (499), TASK COORDINATOR (501), RESOURCE POOL (503), RESOURCE CACHE (505), LAZY ACQUISITION (507), EAGER ACQUISITION (509), PARTIAL ACQUISITION (511), ACTIVATOR (513), EVICTOR (515), LEASING (517), AUTOMATED GARBAGE COLLECTION (519), COUNTING HANDLE (522), ABSTRACT FACTORY (525), BUILDER (527), FACTORY METHOD (529), and DISPOSAL METHOD (531).
7 From Mud To Structure From Mud To Structure: DOMAIN MODEL (182), LAYERS (185), MODEL-VIEW- CONTROLLER (188), PRESENTATION- ABSTRACTION-CONTROL (191), MICROKERNEL (194), REFLECTION (197), PIPES AND FILTERS (200), SHARED REPOSITORY (202), BLACKBOARD (205), and DOMAIN OBJECT (208).
8 Distribution Infrastructure Distribution Infrastructure: MESSAGING (221), MESSAGE CHANNEL (224), MESSAGE ENDPOINT (227), MESSAGE TRANSLATOR (229), MESSAGE ROUTER (231), BROKER (237), CLIENT PROXY (240), REQUESTOR (242), INVOKER (244), CLIENT REQUEST HANDLER (246), SERVER REQUEST HANDLER (249), and PUBLISHER-SUBSCRIBER (234).
9 Event Demultiplexing and Dispatching Event Demultiplexing and Dispatching: REACTOR (259), PROACTOR (262), ACCEPTOR-CONNECTOR (265), and ASYNCHRONOUS COMPLETION TOKEN (268).
10 Interface Partitioning Interface Partitioning: EXPLICIT INTERFACE (281), EXTENSION INTERFACE (284), INTROSPECTIVE INTERFACE (286), DYNAMIC INVOCATION INTERFACE (288), PROXY (290), BUSINESS DELEGATE (292), FACADE (294), COMBINED METHOD (296), ITERATOR (298), ENUMERATION METHOD (300), and BATCH METHOD (302).
11 Component Partitioning Component Partitioning: ENCAPSULATED IMPLEMENTATION (313), WHOLE-PART (317), COMPOSITE (319), MASTER-SLAVE (321), HALF-OBJECT PLUS PROTOCOL (324), and REPLICATED COMPONENT GROUP (326).
12 Application Control: PAGE CONTROLLER (337), FRONT CONTROLLER (339), APPLICATION CONTROLLER (341), COMMAND PROCESSOR (343), TEMPLATE VIEW (345), TRANSFORM VIEW (347), FIREWALL PROXY (349), and AUTHORIZATION (351).
13 Concurrency Concurrency: HALF-SYNC/HALF- ASYNC (359), LEADER/ FOLLOWERS (362), ACTIVE OBJECT (365), MONITOR OBJECT (368).
14 Synchronization Synchronization: GUARDED SUSPENSION (380), FUTURE (382), THREAD-SAFE INTERFACE (384), DOUBLE- CHECKED LOCKING (386), STRATEGIZED LOCKING (388), SCOPED LOCKING (390), THREAD- SPECIFIC STORAGE (392), COPIED VALUE (394), and IMMUTABLE VALUE (396).
15 Object Interaction: Object Interaction: OBSERVER (405), DOUBLE DISPATCH (408), MEDIATOR (410), MEMENTO (414), CONTEXT OBJECT (416), DATA TRANSFER OBJECT (418), COMMAND (412), and MESSAGE (420).
16 Adaptation and Extension: BRIDGE (436), OBJECT ADAPTER (438), INTERCEPTOR (444), CHAIN OF RESPONSIBILITY (440), INTERPRETER (442), VISITOR (447), DECORATOR (449), TEMPLATE METHOD (453), STRATEGY (455), NULL OBJECT (457), WRAPPER FACADE (459), EXECUTE- AROUND OBJECT (451), and DECLARATIVE COMPONENT CONFIGURATION (461).
17 Object behaviour Object Behavior: OBJECTS FOR STATES (467), METHODS FOR STATES (469), and COLLECTIONS FOR STATES (471).
18 Resource Management: OBJECT MANAGER (492), CONTAINER (488), COMPONENT CONFIGURATOR (490), LOOKUP (495), VIRTUAL PROXY (497), LIFECYCLE CALLBACK (499), TASK COORDINATOR (501), RESOURCE POOL (503), RESOURCE CACHE (505), LAZY ACQUISITION (507), EAGER ACQUISITION (509), PARTIAL ACQUISITION (511), ACTIVATOR (513), EVICTOR (515), LEASING (517), AUTOMATED GARBAGE COLLECTION (519), COUNTING HANDLE (522), ABSTRACT FACTORY (525), BUILDER (527), FACTORY METHOD (529), and DISPOSAL METHOD (531).
19 Composed Patterns Example 14 Patterns involved in implementing a Object Request Broker
20 Half Sync / Half Sync Example Android Activities are synchronous - single threaded in the context of user interaction Service access is asynchronous - inherently unreliable access to remote application service Half Sync/Half Async an appropriate pattern to tackle this problem
21 Half Sync/ Half Async Pattern - Context When developing concurrent software, specifically a concurrent ENCAPSULATED IMPLEMENTATION (313) or a network server that employs a REACTOR (259) or PROACTOR (262) event handling infrastructure we need to make performance efficient and scalable while ensuring that any use of concurrency simplifies programming.
22 Half Sync/ Half Async Pattern - Synchrony Concurrent software often performs both asynchronous and synchronous service processing. Asynchrony is used to process low-level system services efficiently, Synchrony to simplify application service processing. To benefit from both programming models, however, it is essential to coordinate asynchronous and synchronous service processing efficiently.
23 Half Sync/ Half Async Pattern - Structure Decompose the services of concurrent software into two separated layers synchronous and asynchronous and add a queueing layer to mediate communication between them.
24 Half Sync/ Half Async Pattern - Responsibilities Process higher-level services, such as domain functionality, database queries, or file transfers, synchronously in separate threads or processes. Conversely, process lower-level system services, such as short-lived protocol handlers driven by interrupts from network hard- ware, asynchronously. If services in the synchronous layer must communicate with services in the asynchronous layer, have them exchange messages via a queueing layer.
25 Half Sync/ Half Async Pattern - Benefits Simplification & performance The programming of higher-level synchronous processing services are simplified without degrading the performance of lower-level system services Separation of concerns Synchronization policies in each layer are decoupled so that each layer need not use the same concurrency strategies Centralization of inter-layer communication Inter-layer communication is centralized at a single access point, because all interaction is mediated by the queueing layer
26 Half Sync/ Half Async Pattern - Limitations May incur a boundary-crossing penalty Arising from context switching, synchronization, & data copying overhead when data transferred between sync & async service layers via queueing layer Higher-level app services may not benefit from async I/O Depending on design of OS or application framework interfaces, higher-level services may not use low-level async I/O devices effectively Complexity of debugging & testing Apps can be hard to debug due to concurrent execution
27 Except where otherwise noted, this content is licensed under a Creative Commons Attribution-NonCommercial 3.0 License.! For more information, please see creativecommons.org/licenses/by-nc/3.0/
COPYRIGHTED MATERIAL. Table of Contents. Foreword... xv. About This Book... xvii. About The Authors... xxiii. Guide To The Reader...
Table of Contents Foreword..................... xv About This Book... xvii About The Authors............... xxiii Guide To The Reader.............. xxvii Part I Some Concepts.................. 1 1 On Patterns
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